MR-Guided Adaptive Radiotherapy for Bladder Cancer.

Area of Science:

• Radiation Oncology
• Medical Imaging
• Urologic Oncology

Background:

• Radiotherapy is crucial for bladder cancer treatment, but challenges like poor tumor visualization and anatomical variability exist.
• Magnetic resonance imaging (MRI) aids tumor visualization and local staging in bladder cancer.
• Current radiotherapy techniques face limitations in adapting to bladder size and position changes during treatment.

Purpose of the Study:

• To examine the technical challenges associated with bladder cancer radiotherapy.
• To explore the potential of magnetic resonance (MR) guided radiotherapy (MRgRT) in improving bladder cancer patient outcomes.
• To assess the role of MR-Linac technology in adaptive radiotherapy for bladder cancer.

Main Methods:

• Review of technical challenges in bladder radiotherapy.
• Exploration of magnetic resonance imaging (MRI) for tumor visualization and staging.
• Discussion of MR-guided radiotherapy (MRgRT) systems, including MR-Linac capabilities for real-time imaging and adaptive planning.

Main Results:

• Bladder radiotherapy faces challenges including poor tumor visibility and anatomical variability.
• MRI enhances tumor visualization and local staging for bladder cancer.
• MR-guided radiotherapy (MRgRT) systems enable in-room, real-time MRI and adaptive plan adjustments per fraction.

Conclusions:

• MR-guided radiotherapy (MRgRT) presents a promising approach to overcome technical challenges in bladder cancer radiotherapy.
• Real-time imaging and adaptive planning via MR-Linac may offer significant advantages for bladder cancer patients.
• Robust clinical evidence is required to confirm that MRgRT leads to improved patient outcomes before widespread adoption.